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08-28-2011, 01:37 PM
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#1 |
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Account Suspended
Join Date: Mar 2011
Location: hastings mn
Posts: 186
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Boom
My truck started missing and clattering. Got it trailers home. Pop off the valve cover. Found #7 intake rocker had fallen off. The stud broke off inside the poly lock. The pushrod and lifter where
Pushed up. Pushrod is not bent lifter has no visible damage rocker body has no visible damage. So now I'm contemplating should I replace all the rocker studs? And should I replace the lifter? Should replace the rocker arm? What could be the root cause of the failure? The valves where'nt floated and it wasn't over reved. It has been running pig rich lately. (soot on fenders) I attributed that to not having the proper torque converter. Base idle screw is set higher. Occasionally I will get an audible fart noise out of the air cleaner. Also thinking lack of converter. Posted via Mobile Device |
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08-28-2011, 01:41 PM
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#2 |
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Join Date: Mar 2011
Location: hastings mn
Posts: 186
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Re: Boom
It's a 10:1 383 stoker. Dyno'd at 518 hp with a vac sec 750 Holley 4160
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08-28-2011, 02:13 PM
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#3 |
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Join Date: Mar 2007
Location: san bernardino ca. everywhere
Posts: 3,938
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Re: Boom
are you running roller rockers?? screw in rocker studs or stock studs??
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08-28-2011, 05:50 PM
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#4 |
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Join Date: Mar 2011
Location: hastings mn
Posts: 186
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Re: Boom
Harland sharp 1:5 3/8 screw in. Atop afr 195 eliminators. Comp xe284 hyd. Flat tap. Springs are correct for cam.
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08-28-2011, 06:44 PM
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#5 |
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Registered User
Join Date: May 2007
Location: Mooresville NC/Gainesville GA
Posts: 499
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Re: Boom
I would replace all the studs and polylocks, then check your pushrod length.
__________________
Eric Evans Queen City Shop Truck http://67-72chevytrucks.com/vboard/s...34#post6139834 66 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=543110 |
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08-28-2011, 07:51 PM
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#6 |
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Account Suspended
Join Date: Mar 2011
Location: hastings mn
Posts: 186
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Re: Boom
This was assembled and checked by a reputable shop. I'm positive length was correct.
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08-28-2011, 08:46 PM
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#7 | |
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Registered User
Join Date: May 2011
Location: mich
Posts: 655
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Re: Boom
Quote:
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08-28-2011, 10:00 PM
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#8 |
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Account Suspended
Join Date: Mar 2011
Location: hastings mn
Posts: 186
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Re: Boom
Screw in 3/8. Guide plates. Double spring
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08-28-2011, 10:22 PM
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#9 |
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Account Suspended
Join Date: Mar 2007
Location: san bernardino ca. everywhere
Posts: 3,938
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Re: Boom
was the work they did warrantied??? if so i would try and take it back to them and see whats up
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08-28-2011, 10:27 PM
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#10 | |
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Senior Member
 
Join Date: Feb 2001
Location: New Madison, Ohio
Posts: 21,339
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Re: Boom
Quote:
 X2
__________________
A husband can be right...or...A husband can be happy.  67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc   JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder! |
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08-28-2011, 11:17 PM
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#11 |
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Registered User
 Join Date: Nov 2007
Location: Hermiston, OR
Posts: 947
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Re: Boom
How long are the rocker arm studs you are running? Need to run the taller ones with roller rockers or you will not have enough threads making contact which will weaken it.
__________________
Running in place gets you nowhere fast. -me 1968 GTO 4-spd covnvertible 1970 K-20 4-speed, factory AC. |
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